1.

      Consider the following chemicals: [IAS Prelim] 1. Benzene 2. Carbon tetrachloride 3. Sodium carbonate 4. Trichloroethylene Which of the above/is are used as dry cleaning chemical?

A. 1 only              
B.          2 only
C. 1, 2 and 4 only   
D.          1, 2, 3 and 4
Answer» D.          1, 2, 3 and 4


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